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1.
A roundhouse dick is a spinning cock-slap, usually directed at a persons face.
A roundhouse dick could also be unintentional, as a result of a failed Helicopter for example.

I have actually witnessed this live, as in the example...
Nathaniel swung around with the intention of waving his genitals around, but instead gave Linda a Roundhouse Dick to the face.
de NorwegianWood 31 octobre 2011